[opendtv] Re: XDS and ATSC
- From: "johnwillkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 22 May 2007 19:23:40 -0700
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de John Shutt
Enviado el: Tuesday, May 22, 2007 6:04 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: XDS and ATSC
John,
One last try that even you should be able to understand. If not then I give
up as you are too stubborn to ever admit you are wrong.
What is the definition of GPS time?
Jw>It doesn't include sending 32 bit unsigned integer that denotes the
number of seconds since UTC 00:00:00 January 6, 1980. Does yours ?
http://tycho.usno.navy.mil/gpstt.html
"The GPS epoch is 0000 UT (midnight) on January 6, 1980. GPS time is not
adjusted and therefore is offset from UTC by an integer number of seconds,
due to the insertion of leap seconds."
What is the definition of the STT variable <system_time> as given in A/65C?
Jw>Where is the 32-bit unsigned integer part?
http://www.atsc.org/standards/a_65cr1_with_amend_1.pdf Page 24:
"system_time -- A 32-bit unsigned integer quantity representing the current
system time as the number of GPS seconds since 00:00:00 UTC, January 6th,
1980."
The STT variable <system_time> is GPS time. How can you argue otherwise?
Jw>Because use of your terminology just confuses things. GPS time is not
send as a 32-bit unsigned integer, and because people more knowledgeable
than you or I (on this topic) have told me that to use your terminology
would be incorrect: STTs contain UTC time values not GPS time values, and to
confuse the two shows a lack of care for how standards are written and what
they are meant to do.
John Willkie
John
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